fix: align ecosystem.config.cjs with actual production pm2 process names

The file previously defined dev-backend-midtrans/dev-frontend-midtrans, but
the real production processes are named backend-midtrans-prod and
frontend-midtrans-prod (confirmed via pm2 ls on the server) and were started
with different serve invocation flags (interpreter: none, -s dist -p 3000
instead of interpreter: serve, -p 3001). This file was previously out of
sync with reality, so NODE_ENV=production set here never actually reached
the running backend process.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

ecosystem.config.cjs

@@ -1,7 +1,7 @@
 module.exports = {
   apps : [
     {
-      name      : "dev-backend-midtrans",
+      name      : "backend-midtrans-prod",
       script    : "server/index.cjs",
 
       env: {
@@ -9,11 +9,11 @@ module.exports = {
       }
     },
     {
-      name      : "dev-frontend-midtrans",
-      interpreter: "serve",
-      script    : "dist",
-      args      : "-s -p 3001",
+      name      : "frontend-midtrans-prod",
+      interpreter: "none",
+      script    : "serve",
+      args      : "-s dist -p 3000",
       exec_mode : "fork",
     }
   ]
-};
+};